| America Import Norge AS | Wholesale & retail | 2025 |
| Amet AS | Professional & scientific | 2020 |
| Amet Prosjekt AS | Professional & scientific | 2021 |
| Amfibien AS | Real estate | 2005 |
| Amfibien Invest AS | Real estate | 2018 |
| Ami-Consulting AS | Professional & scientific | 2024 |
| Ami-Eiendom AS | Real estate | 2022 |
| Amino-Group AS | Professional & scientific | 2010 |
| Amls AS | | 2022 |
| Amone Invest AS | | 2024 |
| Ampa AS | Wholesale & retail | 2022 |
| Amper AS | Other services | 2026 |
| Ams Investments AS | Real estate | 2021 |
| Amundsen AS | Wholesale & retail | 2008 |
| Amundsen Sveise Mek Verksted AS | Manufacturing | 1985 |
| Anakin Holding AS | Real estate | 2021 |
| Analogue Orchestra Ans | Information & communication | 2001 |
| Analytical Consultants Ans | Professional & scientific | 2000 |
| Anatoly Sinitsyn Holding AS | | 2026 |
| And Holding AS | | 2019 |
| Andero AS | Professional & scientific | 2014 |
| Anders Askelund Holding AS | Real estate | 2019 |
| Anders Farstad Myrmel Holding AS | | 2026 |
| Anders Hansson Consulting AS | Professional & scientific | 2023 |
| Anders Hoås AS | | 2024 |
| Anders Lundberg Holding AS | | 2022 |
| Anders Muren AS | Education | 2024 |
| Andersen Regnskapskontor AS | Professional & scientific | 1987 |
| Andersen.Co AS | Professional & scientific | 2018 |
| Andersskog Holding AS | Financial services | 2005 |
| Andjoh Holding AS | | 2020 |
| Andor AS | | 2014 |
| Andorsen Holding AS | Wholesale & retail | 2021 |
| Andr. L. Riis AS | Other services | 1985 |
| Andreas Denstad Holding AS | Financial services | 2014 |
| Andreas Espnes AS | Hospitality | 2007 |
| Andresen Byggservice AS | Construction | 2022 |
| Andresen Parkett Og Maling AS | Administrative & support | 2005 |
| André Krogstad Holding AS | | 2019 |
| Andrénalin AS | Arts & recreation | 2019 |
| Andungen Barnehage Trondheim SA | Education | 1992 |
| Andyrs AS | Financial services | 2005 |
| Andøgalaus AS | | 2025 |
| Aneo AS | Energy | 2022 |
| Aneo Energy AS | Energy | 2017 |
| Aneo Fosen Vind Holding AS | Energy | 2015 |
| Aneo Holding 2 AS | Energy | 2022 |
| Aneo Holding AS | Energy | 2022 |
| Aneo Industry AS | Professional & scientific | 2022 |
| Aneo Inv Holding AS | Energy | 2023 |
| Aneo Production Holding AS | Professional & scientific | 2022 |
| Aneo Renewables Holding AS | Energy | 2022 |
| Aneo Renewables Norway AS | Professional & scientific | 2022 |
| Aneo Roan Vind Holding AS | Energy | 2020 |
| Aneo Vind AS | Energy | 2018 |
| Anett Ballett Rakett AS | Arts & recreation | 2022 |
| Anevat Boulevard AS | Real estate | 2007 |
| Angel Næringsbygg Da | Construction | 1998 |
| Angeleers AS | Education | 2016 |
| Angelltrøa Familiebarnehage Da | Education | 2006 |
| Angen AS | Administrative & support | 2010 |
| Angen Eiendom AS | Real estate | 2004 |
| Angen Group AS | Wholesale & retail | 1990 |
| Aninca AS | Professional & scientific | 2007 |
| Aniri AS | Education | 2003 |
| Ankeret Mat AS | Wholesale & retail | 2012 |
| Anku Management AS | Professional & scientific | 2025 |
| Anlegg & Utemiljø AS | Administrative & support | 1989 |
| Anlegg Og Entreprenørservice Aoes AS | Construction | 2018 |
| Anleggsauksjon.No AS | Wholesale & retail | 2024 |
| Anleggsgartner 1 AS | Administrative & support | 2020 |
| Anleggsgartner Marius Megård AS | Administrative & support | 2018 |
| Anleggsgartnermester John a Sivertzen AS | Administrative & support | 1992 |
| Anleggsmaskiner AS | Construction | 2014 |
| Anleggsmaskiner Holding AS | Construction | 2021 |
| Anleggspartner 1 Midt Norge AS | Construction | 2010 |
| Anlera Holding AS | Financial services | 2011 |
| Ann Beate Frisør AS | Other services | 2012 |
| Anna & Azra AS | Information & communication | 2020 |
| Anna N AS | | 2022 |
| Anna's Holding AS | Wholesale & retail | 2008 |
| Annapurna Group AS | Wholesale & retail | 2020 |
| Anncarlo AS | Real estate | 2005 |
| Annes Herrefrisør Ans | Other services | 1995 |
| Annet Vis AS | Professional & scientific | 2020 |
| Annicken Invest AS | | 2023 |
| ANNIK1 AS | | 2025 |
| Annikas Hus AS | Construction | 2020 |
| Anniken Næss-Evensen Holding AS | Administrative & support | 2020 |
| Ans Capella | Wholesale & retail | 1990 |
| Ans Hartmann Hotell | Real estate | 1989 |
| Ans Mamapoma Eiendom | Construction | 2003 |
| Ans Munkegt. 3 | | 1987 |
| Ans Pewe | Wholesale & retail | 1985 |
| Ans Stavsetbygg | Real estate | 1987 |
| Ans Trekanten I | Real estate | 1986 |
| ANS Vestre Rosten 88 B | Real estate | 1986 |
| Anskaffelser Og Prosjektadministrasjon Midt-Norge AS | Professional & scientific | 2026 |
| Ansnes Havn AS | Real estate | 2019 |
| Ansvar Eiendom AS | Real estate | 1988 |